@book{Rabe-Hesketh2012,
author = {Rabe-Hesketh, S. and Skrondal, A.},
title= {Multilevel and Longitudinal Modeling Using Stata, Volume II: Categorical Responses, Counts, and Survival (Third Edition)},
year = {2012},
address = {College Station},
publisher = {Stata Press},
}